Add ENV storage

src/Storage/EnvStorage.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Toggler package.
+ *
+ * (c) SolidWorx <open-source@solidworx.co>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SolidWorx\Toggler\Storage;
+
+class EnvStorage implements StorageInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function get(string $key)
+    {
+        return $_ENV[$key] ?? $_SERVER[$key] ?? getenv($key) ?? null;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function all(): array
+    {
+        return array_merge($_ENV, $_SERVER, getenv());
+    }
+}

tests/Storage/EnvStorageTest.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Toggler package.
+ *
+ * (c) SolidWorx <open-source@solidworx.co>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SolidWorx\Toggler\Tests\Storage;
+
+use PHPUnit\Framework\TestCase;
+use SolidWorx\Toggler\Storage\EnvStorage;
+
+class EnvStorageTest extends TestCase
+{
+    public function testGet(): void
+    {
+        $storage = new EnvStorage();
+
+        self::assertFalse($storage->get('baz'));
+
+        $_ENV['baz'] = 'foo';
+
+        self::assertSame('foo', $storage->get('baz'));
+
+        unset($_ENV['baz']);
+
+        $_SERVER['baz'] = 'bar';
+
+        self::assertSame('bar', $storage->get('baz'));
+
+        unset($_SERVER['baz']);
+
+        putenv('baz=baz');
+
+        self::assertSame('baz', $storage->get('baz'));
+
+        putenv('baz');
+
+        self::assertFalse($storage->get('baz'));
+
+        self::assertSame($_SERVER, $storage->all());
+
+        $_ENV['foo'] = 'bar';
+
+        self::assertSame(['foo' => 'bar'] + $_SERVER, $storage->all());
+
+        $_SERVER['bar'] = 'baz';
+
+        self::assertSame(['foo' => 'bar'] + $_SERVER, $storage->all());
+
+        putenv('baz=baz');
+
+        self::assertSame(['foo' => 'bar'] + $_SERVER + ['baz' => 'baz'], $storage->all());
+
+        putenv('baz');
+
+        self::assertSame(['foo' => 'bar'] + $_SERVER + ['bar' => 'baz'], $storage->all());
+
+        unset($_ENV['foo'], $_SERVER['bar']);
+
+        self::assertSame($_SERVER, $storage->all());
+    }
+}